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Commit Graph

6 Commits

Author SHA1 Message Date
Virgil Dupras
ce10320030 emul/z80/sms: add SPI exchange through controller port
Theoretically, it works. I can access an emulated SD card on it.

Will it work on real hardware?

I've also made SMS emulation faster. It was unbearably slow for SDC
access.
2020-10-29 19:42:19 -04:00
Virgil Dupras
97a46a7b9b emul/z80: decouple SDC and SPI
My idea of plugging a RC2014 bridge directly onto a Sega Master System
cartridge doesn't work. The SMS eats all I/O addr space, we can't use
it. Therefore, this naive idea, in the emulator, of reusing sdc.c in
sms.c as-is, doesn't work either.

I'll have to find another way of communicating to a SPI device on the
SMS. I'll probably do it through a controller port. Meanwhile, I need
to decouple SPI from SDC in the emulator code so that I can reuse
sdc.c. This is what is done here.
2020-10-29 15:01:25 -04:00
Virgil Dupras
705d68deec Move most of the high layer of comp core into the low one
With KEY and EMIT being switch words, most of the high layer can
be defined before drivers.

In addition to this change, I've compacted core blocks which were
becoming quite sparse.
2020-10-28 18:18:00 -04:00
Virgil Dupras
6947fea2a8 emul/z80: add SD card support to SMS
It works (in emulation, but soon on real hardware!), but the LIST
command is awkward due to tight screen estate...
2020-10-25 16:53:58 -04:00
Virgil Dupras
490eceab6d emul/z80: flatten directory structure
I'm about to reuse sdc.c in sms.c and the old directory structure
was becoming awkward.
2020-10-25 15:58:00 -04:00
Virgil Dupras
efe4b13a4e Move /emul to /emul/z80
I'm planning on adding other subfolders. 8086 for example...
2020-10-24 16:50:22 -04:00